How can i select the most recent purchase by the Clients? - sql

Question

In a database with several tables and relationships between them, I want to select only the most recent payment by the clients last year.
My query goes like this:
SELECT
P.Name,
EV.EventName,
FN.Installments,
FN.PurchaseValue,
FN.DueDate
FROM ClientPrivate PF
JOIN Client P ON P.PesControle = PF.PesControle
JOIN ClientClass CP ON P.PesControle = CP.PesControle
JOIN EVENT EV ON CP.EveControle = EV.EveControle
JOIN Class cc ON cc.CurControle = EV.CurControle
JOIN Finance FN ON FN.PesControle = P.PesControle
It returns the values I need, only I'd like to get only the most recent purchase by each client, instead of all of them.
I edited to help clarify. The 'Controle' columns are the keys.

Answer 1

Whatever you date column is put that in the ORDER BY Clause of the ROW_NUMBER() function and you are good to go.
;WITH CTE AS
(
SELECT
P.PesNome,
EV.EveDescri,
FN.FinTotParc,
FN.FinVlrLiquido,
FN.FinDiaVencto,
ROW_NUMBER() OVER (PARTITION BY P.PesNome ORDER BY [DateColumn] DESC) rn
FROM PessoaFisica PF
JOIN Pessoa P ON P.PesControle = PF.PesControle
JOIN CursoPessoa CP ON P.PesControle = CP.PesControle
JOIN EVENTO EV ON CP.EveControle = EV.EveControle
JOIN Curso cc ON cc.CurControle = EV.CurControle
JOIN Financeiro FN ON FN.PesControle = P.PesControle
)
SELECT *
FROM CTE
WHERE rn = 1

Answer 2

I'm guessing Financeiro.FinDiaVencto is your purchase date, and that Pessoa.PesControle is a unique identifier for a person. If not, you'll need to modify the query. I'm using Google to translate Portuguese, and it's still not clear to me.
SELECT
P.PesNome,
EV.EveDescri,
FN.FinTotParc,
FN.FinVlrLiquido,
FN.FinDiaVencto
FROM PessoaFisica PF
JOIN Pessoa P
ON P.PesControle = PF.PesControle
JOIN CursoPessoa CP
ON P.PesControle = CP.PesControle
JOIN EVENTO EV
ON CP.EveControle = EV.EveControle
JOIN Curso cc
ON cc.CurControle = EV.CurControle
JOIN Financeiro FN
on FN.PesControle = P.PesControle
WHERE EXISTS (
SELECT 1
FROM PessoaFisica PF_s
JOIN Pessoa P_s
ON P_s.PesControle = PF_s.PesControle
JOIN CursoPessoa CP_s
ON P_s.PesControle = CP_s.PesControle
JOIN EVENTO EV_s
ON CP_s.EveControle = EV_s.EveControle
JOIN Curso cc_s
ON cc_s.CurControle = EV_s.CurControle
JOIN Financeiro FN_s
on FN_s.PesControle = P_s.PesControle
WHERE P_s.PesControle = P.PesControle
HAVING MAX(FN_s.FinDiaVencto) = FN.FinDiaVencto
)
That should return the record with the most recent Financeiro.FinDiaVencto for each Pessoa.PesControle. If you need it by course or by event(?) you'll need to modify the WHERE clause to join on those fields, too.
I'm not sure if that join to PessoaFisica is necessary either, but I included it because it could be eliminating records. You can include a GROUP BY in the subquery, but it should be redundant.